How to crack my iPhone 4S screen?

I'm getting a new phone for Christmas and my friends and I have made it our mission to crack the screen of my phone. The only problem? It won't crack! We've thrown it, hit it, dropped it, everything possible that would normally break the screen on the first try. It's almost as if it's indestructible, which is surprising for an iPhone. What can I do to crack it?

Sony xperia m4 aqua or Iphone 5c?

I just need a new phone for Pokemon Go, and a guy I know who works for an electronics store can get me either one (used) at the same price, but which one is the "better phone"

Is my iPhone 6s being tapped?

I only have a slight suspicion of that it might be because when calling someone earlier today I experienced a lot of static noise during the call. Thing is right afterwards I called somebody else and there were no weird noises at all, so could it just a problem with that specific personI called first? Also I have never seen any other suspicious activity on my iPhone like unknown numbers calling me or anything of the sort, but I just want to be sure.

2.5d glass plastic outer rim?

My friend recently scuffed the plastic rim covering the 2.5d glass present on my iPhone 7 and this annoys me.
He scratched it on a granite bench while I was playing basketball at school.
Is there any method or anything that can mask away the scuff? Like are there any plastic filling, paint or anything?